Hey Stefan,

we hadn't any problems with them. We wrote them about our block on 14.01. and they did respond on the same day. When did you wrote them ? Did your wrote postmas...@ewetel.net or did you wrote postmas...@ewe.net ?

Based on their answer, i think they have a internal list with dynamic ip ranges.

Best,
Jan-Philipp

Jan-Philipp Benecke
Deliverability Engineer

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Stefan Bauer via mailop schrieb am 09.03.20 um 15:03:
AW: [mailop] Ewetel postmaster wanted - your IP 116.203.31.6 seems to be dynamic - please use the smarthost of your ISP

Hi,


it's just DNS round robin for our senders. did not had a sigle issue with that over the previous 2 years.


Still thinking, that ewetel/ewe just uses ancient RBLs, that reports the specific IP from a dynamic-block.


Stefan



    -----Ursprüngliche Nachricht-----
    *Von:* Vytis Marciulionis <marciulionis.vy...@gmail.com>
    *Gesendet:* Montag 9 März 2020 14:52
    *An:* Stefan Bauer <stefan.ba...@cubewerk.de>
    *CC:* mailop <mailop@mailop.org>
    *Betreff:* Re: [mailop] Ewetel postmaster wanted - your IP
    116.203.31.6 seems to be dynamic - please use the smarthost of
    your ISP

    Hi Stefan,

    This could also happen because your PTR record of sending IP
    address resolves with 3 IPs e:
    IP  116.203.31.6 - PTR securetransport.cubewerk.de
    <http://securetransport.cubewerk.de> - IPs 178.254.23.77;
    116.203.31.6; 188.68.39.254

    I know that technically it is nothing bad but, I can imagine why
    some sensors could return errors, especially since the 3 IP
    addresses are from different ASNs:
    image.png

    I guess those 3 IPs are set as fallback in this situation?


    On Mon, Mar 9, 2020 at 11:03 AM Stefan Bauer via mailop
    <mailop@mailop.org <mailto:mailop@mailop.org>> wrote:

        Never had delivery issues from hetzner-blocks so far (crossing
        fingers) but I'm aware of the past.


        Looks like there is at least one RBL around, that list our IP
        as dynamic.

        https://www.rbl-dns.com/bl?ip=116.203.31.6

        One just have to pay to get de-listed. What a wonderful world.


        Stefan


            -----Ursprüngliche Nachricht-----
            *Von:* Andrew C Aitchison <and...@aitchison.me.uk
            <mailto:and...@aitchison.me.uk>>
            *Gesendet:* Montag 9 März 2020 10:47
            *An:* Stefan Bauer <stefan.ba...@cubewerk.de
            <mailto:stefan.ba...@cubewerk.de>>
            *CC:* mailop <mailop@mailop.org <mailto:mailop@mailop.org>>
            *Betreff:* Re: [mailop] Ewetel postmaster wanted - your IP
            116.203.31.6 seems to be dynamic - please use the
            smarthost of your ISP

            On Mon, 9 Mar 2020, Stefan Bauer via mailop wrote:

            > Any ewetel postmaster around? One of our IPs (subject) get flagged
            > as dynamic during delivery to ewetel. However this IP is static.

            I am not surprised that Ewetel has guessed wrong:
                whois 116.203.31.6 -hwhois.ripe.net <http://whois.ripe.net>
            gives a /16 belonging to our old friends Hetzner.

-- Andrew C. Aitchison Kendal, UK
                                and...@aitchison.me.uk 
<mailto:and...@aitchison.me.uk>

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-- Pagarbiai,
    Vytis Marčiulionis
    +37064734475



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